Souls will never charge a Vaal skill in the character's secondary weapon set. Each soul gained will charge a random Vaal skill equipped on the character. Souls can also be obtained when damaging Rare or Unique enemies (1 or 6 souls, respectively, per 2% life lost with a 1 second cooldown). Souls can be obtained by killing enemies, granting 1 souls per kill. To use a Vaal skill, its gem must first be charged by collecting souls. Anything supported to the Vaal skill gem will apply to both skills, as long as they're applicable. Vaal skill gems grant both the base version of the skill and the Vaal version of the skill. Per 1% Quality: 1 Superior 0.5% increased Attack Speed Deals (91-135.46)% of Base Attack DamageР”В¬orrupted Place into an item socket of the right colour to gain this skill. It spirals out in a spinning attack that strikes enemies in its path. has a chance of turning it into Vaal Spectral Throw Vaal Spectral Throw Vaal, Attack, ProjectileР”В®ffectiveness of Added Damage: (91-135)% Throws a spectral copy of your melee weapon. Per 1% Quality: 1 Superior 2 Anomalous 3 Divergent 0.5% increased Attack Speed 1% increased Projectile Speed 0.5% reduced Projectile SpeedР”Р‡ires an additional Projectile Deals (80-100)% of Base Attack Damage Place into an item socket of the right colour to gain this skill. It flies out and then returns to you, in a spinning attack that damages enemies in its path. Projectile Speed: 1000 Throws a spectral copy of your melee weapon. using a Vaal Orb on Spectral Throw Spectral Throw Attack, Projectile

(or Lapidary Lens) on a corresponding normal skill gem ( e.g. Corrupted items cannot be modified again. It is also possible to create a Vaal skill gem by using a Vaal Orb Vaal Orb Stack Size: 10 Corrupts an item, modifying it unpredictably Right click this item then left click an item to corrupt it. Vaal skill gems can be looted from vaal side areas, certain strongboxes, certain divination card, and bosses of corrupted maps. Vaal skills are granted by Vaal skill gems, a special type of corrupt skill gem that grants an alternative version of the skill with powerful added effects fueled by the souls of slain enemies, as well as the regular version of the skill. Description on the official Path of Exile website

Path of exile wiki corrupted gems